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Updated: Mar 25, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
Published on: September 23, 2021
Quantum discord length is enhanced while entanglement length is not by introducing disorder in a spin chain
Debasis Sadhukhan1, Sudipto Singha Roy1, Debraj Rakshit1
1Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211 019, India.
Abstract:
Classical correlation functions of ground states typically decay exponentially and polynomially, respectively, for gapped and gapless short-range quantum spin systems. In such systems, entanglement decays exponentially even at the quantum critical points. However, quantum discord, an information-theoretic quantum correlation measure, survives long lattice distances. We investigate the effects of quenched disorder on quantum correlation lengths of quenched averaged entanglement and quantum discord, in the anisotropic XY and XYZ spin glass and random field chains. We find that there is virtually neither reduction nor enhancement in entanglement length while quantum discord length increases significantly with the introduction of the quenched disorder.
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